RULE:
Draw two straight lines on the clock face so that the sums of the numbers in each part are equal.
HINTS: Scroll down this post to get hints and then the answer.
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HINT#1:
2 lines across a clock face will give 3 sections, whilst 2 crossed lines will give 4 sections.
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HINT#2:
Add up all the numbers on the clock face and consider some divisions of that number.
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ANSWER:
2 parallell lines divide the face into 3 sections, 78/3 = 26 so each line must bound a count of 26.
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